slow average temperature changes are more compatible with a low-sensitivity than a high-sensitivity model of greenhouse warming; that clouds may slow the warming as much as water vapour may amplify it; that the increase in methane has been (erratically) decelerating for twenty years; that there were warmer periods in earth’s history in medieval times and about 6,000 years ago yet no accelerations or ‘tipping points’ were reached; and that humanity and nature survived much faster warming lurches in climate during the ice ages than anything predicted for this century.
